<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="btnenter">输入喜欢的水果</button>
    <script>
        var btn=document.getElementById('btnenter')
        btn.onclick=function(){
            var fruit=prompt('输入你喜欢的水果')
            console.log(fruit)
        }
    </script>
</body>
</html>